CN108132688A - A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization method - Google Patents
A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization method Download PDFInfo
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- CN108132688A CN108132688A CN201711485158.2A CN201711485158A CN108132688A CN 108132688 A CN108132688 A CN 108132688A CN 201711485158 A CN201711485158 A CN 201711485158A CN 108132688 A CN108132688 A CN 108132688A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
- G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
- G05F1/445—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being transistors in series with the load
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The invention discloses a kind of 12 tunnel integration voltage regulating and stabilizing devices of three-phase, and including three-phase zero sample circuit, trigger output circuit, load voltage sample circuit, trigger output circuit is provided with onboard silicon-controlled；The input termination three-phase alternating current of three-phase zero sample circuit, output terminal connects microcontroller, for detecting three-phase alternating current zero；The input terminal of trigger output circuit connects microcontroller, exports terminating load, is exported for phase shifting control；The input terminating load of load voltage sample circuit, output terminal connect microcontroller, for real-time sampling load voltage.The present invention is efficiently solved under existing voltage regulating mode, and power output is more not sufficiently stable and accurately, is influenced the problem of bigger by power network fluctuation.
Description
Technical field
The present invention relates to a kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization methods.
Background technology
Voltage regulating and stabilizing device is all based on the adjustment and control of mean voltage on Vehicles Collected from Market, this is deposited in most cases
In practical problem, i.e., differ with load practical function to.Average value is only capable of the voltage that reflection load is born within a certain period of time
Average magnitude, and actual loading is played a role with amount of work, is presented effect.Under the voltage regulating mode, power output is more not
It is enough to stablize and accurately, influenced by power network fluctuation bigger.
Invention content
The object of the present invention is to provide a kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization methods, solve existing
Have under voltage regulating mode, power output is more not sufficiently stable and accurately, is influenced the problem of bigger by power network fluctuation.
The technical solution adopted by the present invention to solve the technical problems is：A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase,
Including three-phase zero sample circuit, trigger output circuit, load voltage sample circuit, trigger output circuit is provided with onboard controllable
Silicon；
The input termination three-phase alternating current of three-phase zero sample circuit, output terminal connects microcontroller, for detecting three-phase alternating current
Zero；
The input terminal of trigger output circuit connects microcontroller, exports terminating load, is exported for phase shifting control；
The input terminating load of load voltage sample circuit, output terminal meet microcontroller ADC, and electricity is loaded for real-time sampling
Pressure.
Further, three-phase zero sample circuit includes first resistor R1, second resistance R2,3rd resistor R3, the 4th electricity
Hinder R4, the 5th resistance R5, the 6th resistance R6, the first electric bridge B1, the second electric bridge B2, third electric bridge B3, the first optocoupler U1, the second light
Coupling U2, third optocoupler U3, the first capacitance C1, the second capacitance C2, third capacitance C3, the first chip (U0), wherein A phases zero sample
In, a termination LA of first resistor R1, the other end terminates 3 feet of the first electric bridge B1, and 1 foot of the first electric bridge B1 connects the first optocoupler
1 foot of U1,2 feet of the first electric bridge B1 connect 2 feet of the first optocoupler U1, mono- termination power 3V3 of second resistance R2, another termination first
1 foot of 2 feet of optocoupler U1, one end of the first capacitance C1 and the first chip (U0), 2 feet of the first chip (U0) and its 13 foot phase
It connects, 12 feet of the first chip (U0) connect the detection of Chip Microcomputer A phase zero；A termination LB of 3rd resistor R3, another the second electricity of termination
3 feet of bridge B2,1 foot of the second electric bridge B2 connect 1 foot of the second optocoupler U2, and 2 feet of the second electric bridge B2 connect 2 feet of the second optocoupler U2；
One end of 4th resistance R4 and power supply 3V3 connect, 4 feet of the other end and two optocoupler U2, one end of the second capacitance C2, the first chip
(U0) 5 feet connect；A termination LC of 5th electric resistance R5,3 feet of another termination third electric bridge B3,1 foot of third electric bridge B3
1 foot of third optocoupler U3 is connect, 2 feet of third electric bridge B3 connect 2 feet of third optocoupler U3, and the 4 of third optocoupler U3 meets the 6th resistance R6
One end, one end of third capacitance C3, the first chip U0 9 feet；3 feet and 6 feet of first chip U0 connect, the first chip U0's
8 feet and 11 feet connect, and 4 feet of the first chip U0 connect the detection of microcontroller B phases zero, the detection of 10 foot microcontroller C phases zeros；First
4 feet of electric bridge B1,4 feet of the second electric bridge B2, third electric bridge B3 4 feet meet N；The other end of first capacitance C1, the second capacitance C2
The other end, the other end of third capacitance C3,3 feet of the first optocoupler U1,3 feet of the second optocoupler U2, third optocoupler U3 3 feet,
The 7 feet ground connection of first chip U0.
Further, trigger output circuit includes the 28th resistance R28, the 29th resistance R29, triode Q1,12V
Silicon-controlled phase shift output module U13, wherein one end of the 28th resistance R28 connects microcontroller control output, another termination second
One end of 19 resistance R29 and the base stage of triode Q1, the collector of triode Q1 meet the silicon-controlled phase shift output module U13 of 12V
2 foot IN-, the other end ground connection of the emitter of triode Q1 and the 29th resistance R29.
Load voltage sample circuit include the 56th resistance R56, the 57th resistance R57, the 62nd resistance R62,
Diode D7, wherein mono- terminating loads of the 57th resistance R57, the anode of another terminating diode D7, the cathode of diode D7
The bottom end of the 56th resistance R56 and one end of the 62nd resistance R62 are connect, the 62nd resistance R62 other ends are grounded, and the 5th
The 16 resistance R56 other ends connect microcontroller sampling.
A kind of voltage-regulation voltage-stabilization method of 12 tunnel integration voltage regulating and stabilizing device of three-phase, includes the following steps：
A, output is triggered per mutually four tunnels of each setting in three-phase alternating current, microcontroller adopts the voltage that three-phase synchronizes
Sample, sampling interval 28us at the end of each ac cycle, obtain arithmetic mean of instantaneous value, and according to the ginseng of calibration system immediately
Number, converts out RMS voltage, i.e., a data is obtained (during 50Hz) per 20ms, and three-phase is synchronous, and per corresponding four
Road triggering output is rotation, that is to say a cycle as after 80ms, certain RMS voltage all the way will be refreshed；
B, computational methods that waveform voltage is calculated as to RMS voltage are as follows：Mean voltage is first calculated, is calculated
Formula is：Vtmp=(V1*V1+V2*V2+ ... .Vn*Vn)；Wherein n is to take an instantaneous voltage at interval of 28us, when frequency is
During 50Hz, the period is about 714 for full sine wave a 20ms, n；RMS voltage Vrms is equal to the square root of Vtmp.
Beneficial effects of the present invention：Per road, output uses onboard silicon-controlled, not only simplifies wiring, also largely keeps away
The problem of having exempted from the disturbed false triggering that may be present of external silicon controlled module.What is be calculated not only has the virtual value electricity of exchange
Pressure, also have its mean voltage, can free switching check also can be switched control, i.e., the very stable situation of power grid need again with put down
During this for adjustment target demand of equal threshold voltage, controllably need to switch.Even if due to industrial electrical network different periods voltage instability, wave
Dynamic big situation, virtual value voltage regulating mode also can keep constant load acting.
Below with reference to drawings and examples, the present invention is described in detail.
Description of the drawings
Fig. 1 is the circuit block diagram of the present invention.
Fig. 2 is three-phase zero sample circuit figure.
Fig. 3 is trigger output circuit figure.
Fig. 4 is load voltage sample circuit figure.
Specific embodiment
Embodiment, 12 tunnel integration voltage regulating and stabilizing device of a kind of three-phase as shown in Figures 1 to 4 are sampled including three-phase zero
Circuit, trigger output circuit, load voltage sample circuit, trigger output circuit are provided with onboard silicon-controlled；
The input termination three-phase alternating current of three-phase zero sample circuit, output terminal connects microcontroller, for detecting three-phase alternating current
Zero；
The input terminal of trigger output circuit connects microcontroller, exports terminating load, is exported for phase shifting control；
The input terminating load of load voltage sample circuit, output terminal connect microcontroller, for real-time sampling load voltage.
Three-phase zero sample circuit includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th
Resistance R5, the 6th resistance R6, the first electric bridge B1, the second electric bridge B2, third electric bridge B3, the first optocoupler U1, the second optocoupler U2, third
In the sampling of optocoupler U3, the first capacitance C1, the second capacitance C2, third capacitance C3, the first chip (U0), wherein A phases zero, the first electricity
A termination LA of R1 is hindered, the other end terminates 3 feet of the first electric bridge B1, and 1 foot of the first electric bridge B1 connects 1 foot of the first optocoupler U1,
2 feet of first electric bridge B1 connect 2 feet of the first optocoupler U1, mono- termination power 3V3 of second resistance R2, the first optocoupler U1's of another termination
1 foot of 2 feet, one end of the first capacitance C1 and the first chip (U0), 2 feet of the first chip (U0) connect with its 13 foot, the first core
12 feet of piece (U0) connect the detection of Chip Microcomputer A phase zero；A termination LB of 3rd resistor R3,3 feet of the second electric bridge B2 of another termination,
1 foot of second electric bridge B2 connects 1 foot of the second optocoupler U2, and 2 feet of the second electric bridge B2 connect 2 feet of the second optocoupler U2；4th resistance R4
One end and power supply 3V3 connect, 4 feet of the other end and two optocoupler U2, one end of the second capacitance C2, the first chip (U0) 5 feet
Connect；A termination LC of 5th electric resistance R5,3 feet of another termination third electric bridge B3,1 foot of third electric bridge B3 connect third optocoupler
1 foot of U3,2 feet of third electric bridge B3 connect 2 feet of third optocoupler U3, and the 4 of third optocoupler U3 connects one end of the 6th resistance R6, third
One end of capacitance C3,9 feet of the first chip U0；3 feet and 6 feet of first chip U0 connect, 8 feet of the first chip U0 and 11 foot phases
It connects, 4 feet of the first chip U0 connect the detection of microcontroller B phases zero, the detection of 10 foot microcontroller C phases zeros；The 4 of first electric bridge B1
Foot, 4 feet of the second electric bridge B2, third electric bridge B3 4 feet meet N；The other end of first capacitance C1, the second capacitance C2 the other end,
The other end of third capacitance C3,3 feet of the first optocoupler U1,3 feet of the second optocoupler U2,3 feet of third optocoupler U3, the first chip U0
7 feet ground connection.
Trigger output circuit includes the 28th resistance R28, the 29th resistance R29, the silicon-controlled shifting of triode Q1,12V
Phase output module U13, wherein one end of the 28th resistance R28 connects microcontroller control output, the 29th resistance of another termination
One end of R29 and the base stage of triode Q1, the collector of triode Q1 meet the 2 foot IN- of the silicon-controlled phase shift output module U13 of 12V,
The other end of the emitter of triode Q1 and the 29th resistance R29 are grounded.
Load voltage sample circuit include the 56th resistance R56, the 57th resistance R57, the 62nd resistance R62,
Diode D7, wherein mono- terminating loads of the 57th resistance R57, the anode of another terminating diode D7, the cathode of diode D7
The bottom end of the 56th resistance R56 and one end of the 62nd resistance R62 are connect, the 62nd resistance R62 other ends are grounded, and the 5th
The 16 resistance R56 other ends connect microcontroller sampling.
A kind of voltage-regulation voltage-stabilization method of 12 tunnel integration voltage regulating and stabilizing device of three-phase, includes the following steps：
A, output is triggered per mutually four tunnels of each setting in three-phase alternating current, microcontroller adopts the voltage that three-phase synchronizes
Sample, sampling interval 28us at the end of each ac cycle, obtain arithmetic mean of instantaneous value, and according to the ginseng of calibration system immediately
Number, converts out RMS voltage, i.e., a data is obtained (during 50Hz) per 20ms, and three-phase is synchronous, and per corresponding four
Road triggering output is rotation, that is to say a cycle as after 80ms, certain RMS voltage all the way will be refreshed；
B, computational methods that waveform voltage is calculated as to RMS voltage are as follows：Mean voltage is first calculated, is calculated
Formula is：Vtmp=(V1*V1+V2*V2+ ... .Vn*Vn)；Wherein n is to take an instantaneous voltage at interval of 28us, when frequency is
During 50Hz, the period is about 714 for full sine wave a 20ms, n；RMS voltage Vrms is equal to the square root of Vtmp.
The present invention is exemplarily described above in association with attached drawing.Obviously, present invention specific implementation is not by above-mentioned side
The limitation of formula.As long as employ the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (5)
1. a kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase, it is characterised in that：Including three-phase zero sample circuit, triggering output electricity
Road, load voltage sample circuit, trigger output circuit are provided with onboard silicon-controlled；
The input termination three-phase alternating current of three-phase zero sample circuit, output terminal connects microcontroller, for detecting three-phase alternating current zero；
The input terminal of trigger output circuit connects microcontroller, exports terminating load, is exported for phase shifting control；
The input terminating load of load voltage sample circuit, output terminal connect microcontroller, for real-time sampling load voltage.
2. 12 tunnel integration voltage regulating and stabilizing device of three-phase according to claim 1, it is characterised in that：Three-phase zero sample circuit
Including first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance
(R6), the first electric bridge (B1), the second electric bridge (B2), third electric bridge (B3), the first optocoupler (U1), the second optocoupler (U2), third light
In the sampling of coupling (U3), the first capacitance (C1), the second capacitance (C2), third capacitance (C3), the first chip (U0), wherein A phases zero,
One termination LA of first resistor (R1), the other end terminate 3 feet of the first electric bridge (B1), and 1 foot of the first electric bridge (B1) connects first
1 foot of optocoupler (U1), 2 feet of the first electric bridge (B1) connect 2 feet of the first optocoupler (U1), second resistance (R2) termination power 3V3,
2 feet, one end of the first capacitance (C1) and 1 foot of the first chip (U0) of the first optocoupler of another termination (U1), the first chip (U0)
2 feet connect with its 13 foot, 12 feet of the first chip (U0) connect the detection of Chip Microcomputer A phase zero；One termination of 3rd resistor (R3)
LB, 3 feet of the second electric bridge of another termination (B2), 1 foot of the second electric bridge (B2) connect 1 foot of the second optocoupler (U2), the second electric bridge
(B2) 2 feet connect 2 feet of the second optocoupler (U2)；One end of 4th resistance (R4) and power supply 3V3 connect, the other end and two optocouplers
(U2) 4 feet, one end of the second capacitance (C2), the first chip (U0) 5 feet connect；One termination LC of the 5th electric resistance (R5),
3 feet of another termination third electric bridge (B3), 1 foot of third electric bridge (B3) connect 1 foot of third optocoupler (U3), third electric bridge (B3)
2 feet connect 2 feet of third optocoupler (U3), the 4 of third optocoupler (U3) connect one end of the 6th resistance (R6), third capacitance (C3) one
End, 9 feet of the first chip (U0)；3 feet and 6 feet of first chip (U0) connect, and 8 feet and 11 feet of the first chip (U0) connect,
4 feet of the first chip (U0) connect the detection of microcontroller B phases zero, the detection of 10 foot microcontroller C phases zeros；The 4 of first electric bridge (B1)
Foot, 4 feet of the second electric bridge (B2), third electric bridge (B3) 4 feet meet N；The other end of first capacitance (C1), the second capacitance (C2)
The other end, the other end of third capacitance (C3), 3 feet of the first optocoupler (U1), 3 feet of the second optocoupler (U2), third optocoupler (U3)
3 feet, the first chip (U0) 7 feet ground connection.
3. 12 tunnel integration voltage regulating and stabilizing device of three-phase according to claim 1 or 2, it is characterised in that：Trigger output circuit
Including the 28th resistance (R28), the 29th resistance (R29), triode (Q1), the silicon-controlled phase shift output modules of 12V
(U13), wherein one end of the 28th resistance (R28) connects microcontroller control output, the 29th resistance (R29) of another termination
One end and the base stage of triode (Q1), the collector of triode (Q1) connect 2 feet of the silicon-controlled phase shift output modules (U13) of 12V
(IN-), the other end of the emitter of triode (Q1) and the 29th resistance (R29) is grounded.
4. 12 tunnel integration voltage regulating and stabilizing device of three-phase according to claim 3, it is characterised in that：Load voltage sample circuit
Including the 56th resistance (R56), the 57th resistance (R57), the 62nd resistance (R62), diode (D7), wherein the 5th
17 resistance (R57) terminating load, the anode of another terminating diode (D7), the cathode of diode (D7) connect the 56th electricity
Hinder the bottom end of (R56) and one end of the 62nd resistance (R62), the 62nd resistance (R62) other end ground connection, the 56th electricity
Resistance (R56) other end connects microcontroller sampling.
A kind of 5. voltage-regulation voltage-stabilization method of 12 tunnel integration voltage regulating and stabilizing device of three-phase, it is characterised in that：
A, output is triggered per mutually four tunnels of each setting in three-phase alternating current, the voltage sample that microcontroller synchronizes three-phase is adopted
28us is divided between sample, at the end of each ac cycle, obtains arithmetic mean of instantaneous value immediately, and according to the parameter of calibration system, turn
Swap out RMS voltage, i.e., a data is obtained (during 50Hz) per 20ms, and three-phase is synchronous, and is triggered per corresponding four tunnel
Output is rotation, that is to say a cycle as after 80ms, certain RMS voltage all the way will be refreshed；
B, computational methods that waveform voltage is calculated as to RMS voltage are as follows：First calculate mean voltage, calculation formula
For：Vtmp=(V1*V1+V2*V2+ ... .Vn*Vn)；Wherein n is to take an instantaneous voltage at interval of 28us, when frequency is 50Hz
When, the period is about 714 for full sine wave a 20ms, n；RMS voltage Vrms is equal to the square root of Vtmp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711485158.2A CN108132688A (en) | 2017-12-29 | 2017-12-29 | A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711485158.2A CN108132688A (en) | 2017-12-29 | 2017-12-29 | A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization method |
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| CN108132688A true CN108132688A (en) | 2018-06-08 |
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| CN201711485158.2A Pending CN108132688A (en) | 2017-12-29 | 2017-12-29 | A kind of 12 tunnel integration voltage regulating and stabilizing device of three-phase and its voltage-regulation voltage-stabilization method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108322098A (en) * | 2018-01-19 | 2018-07-24 | 浙江正泰电器股份有限公司 | Soft starter with control machines abnormal protection |
| CN108964461A (en) * | 2018-08-30 | 2018-12-07 | 科大讯飞股份有限公司 | Dynamic voltage adjustment device and method |
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| CN104500429A (en) * | 2014-11-20 | 2015-04-08 | 广州腾世智能控制系统有限公司 | Speed control device and speed control method of shaded pole fan for gas-heating hot water boiler |
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| CN2285485Y (en) * | 1994-11-03 | 1998-07-01 | 张树华 | Three-phase respective adjusment automatic compensation type voltage stabilizer with ac electric energy real effective value convertor |
| CN201048351Y (en) * | 2007-06-04 | 2008-04-16 | 鲁永忠 | Ultrawide voltage self-adaptive power supply |
| CN102497114A (en) * | 2011-11-29 | 2012-06-13 | 深圳麦格米特电气股份有限公司 | Frequency conversion microwave oven power supply circuit and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322098A (en) * | 2018-01-19 | 2018-07-24 | 浙江正泰电器股份有限公司 | Soft starter with control machines abnormal protection |
| CN108964461A (en) * | 2018-08-30 | 2018-12-07 | 科大讯飞股份有限公司 | Dynamic voltage adjustment device and method |
| CN108964461B (en) * | 2018-08-30 | 2020-07-14 | 西安讯飞超脑信息科技有限公司 | Dynamic pressure regulating device and method |
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Application publication date: 20180608 |